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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 10, 2010 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 18, 2013 | Jan. 21, 2003
Stock Based Compensation [Line Items] |  |  |  |  |  |
Total assets |  | $ 5,886,614 | $ 5,246,829 |  |  |
Total compensation cost |  | 132 | 215 | $ 251 |  |
Tax benefit associated with compensation expense |  | 0 | 45 | 53 |  |
Total compensation cost |  | 1,300 | 920 | 626 |  |
Cash received from option exercise |  | 255 | 236 | 493 |  |
Actual tax benefit realized for the tax deductions |  | 59 | 104 | 213 |  |
Unrecognized compensation cost |  | $ 3,000 |  |  |  |
Weighted-average period cost over which cost is expected to be recognized |  | 1 year 5 months 15 days |  |  |  |
Performance Based Share Awards | Minimum |  |  |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |  |  |
Total assets |  | $ 1,000,000 |  |  |  |
Performance Based Share Awards | Maximum |  |  |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |  |  |
Total assets |  | 5,000,000 |  |  |  |
Restricted and Performance Shares |  |  |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |  |  |
Total compensation cost |  | 0 | 215 |  |  |
Tax benefit associated with compensation expense |  | 253 | 148 | 79 |  |
Total compensation cost |  | $ 1,200 | $ 705 | $ 376 |  |
Option Activity Under the 2003 Plan |  |  |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |  |  |
Maximum common shares issued under the plan |  |  |  |  |  | 759,375
Number of shares available incentive stock options |  |  |  |  |  | 759,375
Non-option awards granted (in shares) |  |  |  |  |  | 379,687
Additional common shares available for issuance (in shares) | 885,937 |  |  |  |  |
Option Activity Under the 2013 Plan |  |  |  |  |  |
Stock Based Compensation [Line Items] |  |  |  |  |  |
Maximum common shares issued under the plan |  |  |  |  | 1,556,325 |
Number of shares available incentive stock options |  |  |  |  | 225,000 |
Non-option awards granted (in shares) |  |  |  |  | 900,000 |
Weighted average grant-date fair value of options granted |  | $ 0.00 | $ 4.44 | $ 5.54 |  |

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